SPOP 426 - Tube Installation Procedures [PW11]

TASK 70-24-00-910-812-A
SPOP 426 - Tube Installation Procedures

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1. Reason for the Job
This procedure gives general instructions for installation of tubes with fixed conical seat ferrules.

NOTE: Always obey the specific procedures and limits in the specific manual tasks.

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
Tubes with Fixed (Brazed) Conical Seat Ferrules (37 degrees)
Installation of Hose and/or Tube Assemblies with Fixed or Loose Flange Ends (Used with Packings or Seal Plates)
Installation of Tubes with Bolted Flanges (Used with Crush-Type Gaskets)

3. Job Set-up
Subtask 70-24-00-860-056-A ** ON A/C NOT FOR ALL

A. Not Applicable

4. Procedure
Subtask 70-24-00-910-054-A ** ON A/C NOT FOR ALL

A. Procedure - Method A - Typical Installation of Tubes (1) with Fixed (Brazed) Conical Seat Ferrules (37 degrees)
(1) Remove all the protective covers from the tube (1) and mating adapters.
(2) Wipe clean the conical seats of the tube (1) and mating adapters.
(3) Examine the conical seats of the tube (1) and the mating adapters for any damage (such as nicks, burrs or wear). Replace, as necessary.
(4) Apply the necessary lubricant to the tube nut (2) threads and to the rear of the tube ferrules (nut loading surface).
(5) Remove any excess lubricant from the tube (1) threads and the conical seat areas.
(6) Install the tube (1) on the mating adapters and tighten the tube nuts (2) with your hand only.

NOTE: Make sure that the tube nuts are hand-tight and that the tube conical seat is fully against the adapter conical seat. To make sure, you can tighten the nut with a wrench until you feel the seats contact and then loosen the nut 1/4 turn.

(7) Make sure that the tube (1) is not bent and that the tube ends align with the mating adapters.
(8) Apply the necessary lubricant to the bolt (3) threads which attach the tube clamps (4).
(9) Attach all the clamps (4) and clamp bolts (3) hand-tight only.
(10) Make sure that the installation of the clamps (4) and clamp bolts (3) do not stress or load the tube (1).

NOTE: When you install and torque clamp bolts (3) before the tube nuts (2), the tube (1) can turn on the conical seats to better align itself. This will put the tube (1) in the final position before you tighten the tube nuts (2) and will decrease any stress on the tube (1) adjacent to the ferrules.

(11) Torque the clamp bolts (3) to the correct torque while you make sure that the clamps (4) do not turn, twist or bend.
(12) While you hold the mating adapter with a wrench, torque the tube nut (2) at each end to the necessary torque called in the specific task.
(13) Examine the tube (1) ends for any evidence of tube twist or damage adjacent to the brazed ferrules. Replace, as necessary.
(14) Safety the tube nuts (2), where necessary.

Subtask 70-24-00-910-055-A ** ON A/C NOT FOR ALL

CAUTION: DO NOT BEND THE FLEXHOSE OF A TUBE TO HELP REMOVE OR INSTALL AN ATTACHED COMPONENT. IF YOU BEND A FLEX SEGMENT TOO MUCH, YOU CAN CAUSE A BREAK DURING SUBSEQUENT ENGINE OPERATION.

B. Procedure - Method B - Typical Installation of Hose and/or Tube Assemblies with Fixed or Loose Flange Ends (Used with Packings or Seal Plates)

NOTE: A flexhose kink is the result of the movement of the flexhose to the point where the shape of the stainless steel wirebraid and the inner PTFE tube changes permanently from cylindrical to oval in one or more locations.

(1) Remove the protective covers.

CAUTION: MAKE SURE THAT YOU REMOVE ANY PROTECTIVE COVERS FROM INSIDE THE TUBE OPENINGS. THESE TYPES OF COVERS HAVE CAUSED IN-FLIGHT SHUTDOWNS WHEN ACCIDENTALLY LEFT INSTALLED.

(a) Remove all the protective covers from the tube (10) and mating adapters.
(2) Wipe clean the flange seats of the tube (10) and mating adapters.
(3) Examine the flange seats of the tube (10) and the mating adapters for any damage (such as nicks, burrs and wear). Replace, as necessary.
(4) Apply the necessary lubricant to the bolts (13) and (17) threads which attach the tube flanges.
(5) Install any necessary packings (18) lubricated with the applicable lubricant.
(6) Carefully install the tube (10) and seal plates (11) to the mating adapters with the bolts (13) and nuts (12) hand-tight only.
(7) If applicable, make sure that the packing (18) engaged the mating adapter fully, without damage.
(8) Tighten the bolts (13) and (17) and nuts (12) and (16) at each end and loosen by two turns.
(9) Apply the necessary lubricant to the bolt (14) threads which attach the tube clamps (15).
(10) Attach all the clamps (15) and clamp bolts (14) and tighten the clamp bolts (14) with your hand only.
(11) Make sure the installation of the clamps (15) and clamp bolts (14) does not stress or load the tube (10).

NOTE: When you install and torque clamp bolts (14) before the bolts (13) and (17) and nuts (12) and (16) at each end of the tube (10), the tube (10) can turn on the seats to better align itself. This will put the tube in final position before you tighten the tube bolts (13) and (17) and nuts (12) and (16) and will decrease any stress on the tube adjacent to the ferrules.

(12) Torque the clamp bolts (14) to the correct torque while you make sure that the clamps (15) do not turn, twist or bend.
(13) Torque the bolts (13) and (17) and nuts (12) and (16) at each end to the necessary torque called in the specific task.
(14) Examine the tube (10) for any tube damage or incorrect assembly. Replace, as necessary.

Subtask 70-24-00-910-056-A ** ON A/C NOT FOR ALL

C. Procedure - Method C - Typical Installation of Tubes with Bolted Flange (Used with Crush-Type Gaskets)
(1) Remove the protective covers.

CAUTION: MAKE SURE THAT YOU REMOVE ANY PROTECTIVE COVERS FROM INSIDE THE TUBE OPENINGS. THESE TYPES OF COVERS HAVE CAUSED IN-FLIGHT SHUTDOWNS WHEN ACCIDENTALLY LEFT INSTALLED.

(a) Remove all the protective covers from the tube (20) and mating bosses.
(2) Wipe clean the flange seats of the tube (20) and mating bosses.
(3) Examine the flange seats of the tube (20) and the mating bosses for any burrs or damage. Replace, as necessary.
(4) Apply the necessary lubricant to the bolts (22) and (25) threads which attach the tube flanges.
(5) Install the necessary new gaskets (21) in the gasket groove in the tube (20) or mating boss flange. Use a small amount of Beeswax or Paraffin Wax Blend to hold them in position.
(6) Carefully install the tube (20) on the mating bosses with the bolts (22) and (25) hand-tight only.
(7) Apply the necessary lubricant to the bolt (23) threads which attach the tube clamps (24).
(8) Attach all the clamps (24) and clamp bolts (23) and tighten the clamp bolts (23) with your hand only.
(9) Make sure that the installation of the clamps (24) and clamp bolts (23) does not stress or load the tube (20).
(10) Torque the bolts (22) and (25) at each end in small increments to the necessary torque. Then, torque all the bolts (22) and (25) again and until the same torque indication holds.
(11) Torque the clamp bolts (23) to the correct torque while you make sure that the clamps (24) do not turn, twist or bend.
(12) Examine the tube (20) for any tube damage or incorrect assembly. Replace, as necessary.

[Rev.10 from 2021] 2026.04.02 06:31:42 UTC